Molybdenum oxide composite and preparation method therefor

Patent metadata

Field	Value
Publication number	US-2017291166-A1
Application number	US-201515510170-A
Country	US
Kind code	A1
Filing date	Sep 30, 2015
Priority date	Oct 1, 2014
Publication date	Oct 12, 2017
Grant date	—

Abstract

According to the present invention, a composite including amorphous iron molybdate islands, shows a smaller island size and a uniform distribution of islands compared with a conventional composite including crystalline islands, and thus has a higher specific surface area, thereby exhibiting excellent activity as a catalyst.

First claim

1 . A composite including a rod-shaped molybdenum oxide and amorphous iron molybdate islands provided on the rod-shaped molybdenum oxide.

2 . The composite of claim 1 , wherein the iron molybdate island includes a material represented by Fe2Mo3O12.

3 . The composite of claim 1 , wherein the content of islands is 10 wt % or less with respect to the entire composite.

4 . The composite of claim 1 , wherein 20 to 100 islands per one rod-shaped molybdenum oxide are included.

5 . The composite of claim 1 , wherein the size of the island is in a range of 10 nm to 50 nm.

6 . The composite of claim 1 , wherein a ratio of respective particle numbers constituting the rod-shaped molybdenum oxide and the islands in the composite is in a range of 30:1 to 60:1.

7 . The composite of claim 1 , wherein a mass ratio of molybdenum (Mo) to iron (Fe) in the composite is in a range of 1:30 to 1:60.

8 . The composite of claim 1 , wherein a specific surface area of the composite is in a range of 8 m2/g to 12 m2/g.

9 . A preparation method of the composite comprising:
(a) preparing a mixed solution of an iron precursor and a solvent; (b) preparing a mixed solution of rod-shaped molybdenum oxide and a solvent; and (c) mixing the solution of (a) and the solution of (b).

10 . The preparation method of claim 9 , wherein the preparation method of the composite is performed by a gram scale.

11 . The preparation method of claim 9 , wherein the iron precursor is a material represented by Fe(NO3)3 9H2O, Fe(NO3)3, Fe(OH)3 or Fe2O3.

12 . The preparation method of claim 9 , wherein step (a) includes stirring a mixed solution of the iron precursor and a solvent.

13 . (canceled)

14 . The preparation method of claim 9 , wherein step (b) includes heating a mixed solution of the rod-shaped molybdenum oxide and a solvent.

15 . The preparation method of claim 14 , wherein the heating is performed from room temperature to a range of 40° C. to 50° C.

16 . The preparation method of claim 9 , wherein step (b) includes stirring while or after heating the mixed solution of the rod-shaped molybdenum oxide and the solvent.

17 . The preparation method of claim 9 , wherein step (c) includes dropping the solution of (a) in the solution of (b) at a constant speed.

18 . The preparation method of claim 9 , further comprising:
isolating the composite of the iron molybdenum and the rod-shaped molybdenum oxide generated in step (c) after step (c).

19 . The preparation method of claim 9 , further comprising:
(d) firing after step (c).

20 . The preparation method of claim 19 , wherein the firing is performed at a temperature range of 500° C. to 700° C.

21 . A catalyst including the composite of claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Song Cheolock
• Hwang Gyo Hyun
• Cho Ara
• Bang Jungup

Classifications

• C01P2002/02

  Amorphous compounds · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/03

  obtained by SEM · CPC title